Search results for "Amphibia"
showing 10 items of 71 documents
Cytotoxicity and antimitotic activity of Rhinella schneideri and Rhinella marina venoms.
2019
Abstract Ethnopharmacological relevance Rhinella schneideri and Rhinella marina are toad venoms distributed in different parts of the world, including Brazil, Columbia and amazon. Venoms extracted from different species have many clinical applications such as antimicrobial cardiotonics and treatment of cancer. Aim of the study; In this study, we aim to investigate the effect of venoms extracted from R. schneideri and R. marina on cancer cells and verify possible mechanism of action. Material and method Cytotoxicity analyses was performed using the resazurin reduction assay, where different concentrations of venoms were tested against sensitive CCRF-CEM and P-gp overexpressing ADR/CEM5000 le…
Indagine su due popolazioni di rana verde (Pelophylax synklepton hispanicus) della Sicilia occidentale
2008
Contribution to the knowledge of Tunisian amphibians: notes on distribution, habitat features and breeding phenology
2009
In order to improve the knowledge on amphibian fauna in Tunisia, about 300 water bodies belonging to different habitat typologies were sampled during the period 2004-2008. At the sites where amphibians were observed, we recorded the UTM coordinates, the altitude, and the following environmental features: habitat typology, hydroperiod, electric conductivity, temperature, water turbidity, and macrophyte coverage. The presence of the seven species currently known with certainty for Tunisia has been confirmed: Pleurodeles nebulosus, Discoglossus pictus, Bufo bufo, B. mauritanicus, B. boulengeri, Hyla meridionalis and Pelophylax saharicus. Conversely, no evidence on the occurrence of Salamandra …
Contribute to the knowledge of Tunisian amphibians: Notes on distribution, habitat features and phenology
2007
The evolutionary course of vertebrate foot, from fish to man
2009
Molecular phylogenetics and historical biogeography of the west-palearctic common toads (Bufo bufo species complex)
2012
In most pan-Eurasiatic species complexes, two phenomena have been traditionally considered key processes of their cladogenesis and biogeography. First, it is hypothesized that the origin and development of the Central Asian Deserts generated a biogeographic barrier that fragmented past continuous distributions in Eastern and Western domains. Second, Pleistocene glaciations have been proposed as the main process driving the regional diversification within each of these domains. The European common toad and its closest relatives provide an interesting opportunity to examine the relative contributions of these paleogeographic and paleoclimatic events to the phylogeny and biogeography of a wide…
Convergent evolution of aposematic coloration in Neotropical poison frogs: a molecular phylogenetic perspective
2003
Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:17:10Z No. of bitstreams: 1 WOS000186417800006.pdf: 196897 bytes, checksum: cbe901a47807d22aec173ee8cc011a64 (MD5) Made available in DSpace on 2014-02-26T17:17:10Z (GMT). No. of bitstreams: 1 WOS000186417800006.pdf: 196897 bytes, checksum: cbe901a47807d22aec173ee8cc011a64 (MD5) Previous issue date: 2003-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:59:12Z No. of bitstreams: 1 WOS000186417800006.pdf: 196897 bytes, checksum: cbe901a47807d22aec173ee8cc011a64 (MD5) Made available in DSpace on 2014-05-20T13:59:12Z (GMT). No. of bitstreams: 1 WOS000186417800006.pdf: 196…
Molecular markers and species delimitation: examples from the European batrachofauna
1996
AbstractMolecular techniques have revolutionised zoological systematics since the beginning of the seventies. Within the last twenty years numerous new amphibian species have been described in Europe almost solely on the basis of molecular data. This paper focuses on the use of molecular character state and genetic distance data for the delimitation of species. Case studies of European anurans (Discoglossus, water frogs of the genus Rana) are discussed in the framework of concurring species concepts to illustrate problems of assigning species status to divergent populations on the basis of molecular data.
Ornamentation of dermal bones of
2017
Background Amphibians are animals strongly dependent on environmental conditions, like temperature, water accessibility, and the trophic state of the reservoirs. Thus, they can be used in modern palaeoenvironmental analysis, reflecting ecological condition of the biotope. Methods To analyse the observed diversity in the temnospondyl Metoposaurus krasiejowensis from Late Triassic deposits in Krasiejów (Opole Voivodeship, Poland), the characteristics of the ornamentation (such as grooves, ridges, tubercules) of 25 clavicles and 13 skulls were observed on macro- and microscales, including the use of a scanning electron microscope for high magnification. The different ornamentation patterns fou…
Modulation of voltage-gated Na+ and K+ channels by pumiliotoxin 251D: A “joint venture” alkaloid from arthropods and amphibians
2008
Abstract Certain amphibians provide themselves with a chemical defense by accumulating lipophilic alkaloids into skin glands from dietary arthropods. Examples of such alkaloids are pumiliotoxins (PTXs). In general, PTXs are known as positive modulators of voltage-gated sodium channels (VGSCs). Unlike other PTXs, PTX 251D does not share this characteristic. However, mice and insect studies showed that PTX 251D is highly toxic and to date the basis of its toxicity remains unknown. In this work, we searched for the possible target of PTX 251D . The toxin was therefore made synthetically and tested on four VGSCs (mammalian rNa v 1.2/β 1 , rNa v 1.4/β 1 , hNa v 1.5/β 1 and insect Para/tipE ) and…